这是效果图，边框会不停的闪，兼容各种浏览器
HTML代码：
<body>
<div class="container">
<form method="post" action="#">
<div class="input-group">
<input type="text" placeholder="请告诉我，你在寻找什么" >
<span class="input-group-btn">
<button class="btn" type="submit">立即搜索</button>
</span>
</div>
</form>
</div>
</body>
CSS代码：
@charset "utf-8";
/* CSS Document */ body{padding:; margin:; font-size:16px;}
input{ border:; outline:;} /* 设置外部容器样式 开始 使用媒体查询以兼容各种设备*/
.container{ width:100%; }
@media(min-width:800px) and (max-width:1280px){.container{ width:65%;}}
@media(min-width:1281px){.container{ width:45%;}}
/* 设置外部容器样式 结束 */ /*设置表单组中输入框的样式*/
.input-group{ width:90%; margin:5%; }
.input-group input { height:3em; line-height:3em; width:66%; border:1px solid #cccccc; border-top-left-radius:1.5em;/*设置左上角的边框*/
border-bottom-left-radius:1.5em;/*控制左下边的边框*/padding-left:1.2em; font-size:14px;}
@media(min-width:800px) and (max-width:1280px){.input-group input{ height:3em; line-height:3em; font-size:22px;}} /* 设置按钮样式的内边距 */
.btn{width:27%; float:right;} /* 设置表单组中按钮的样式 */
.input-group .input-group-btn .btn{
height:2.9em;
border:1px solid #cccccc;
border-top-right-radius:1.5em;
border-bottom-right-radius:1.5em;
border-left:none;
color:white;
/*text-shadow:0 0 2px #fff, 0 0 4px #fff, 0 0 60px #fff, 0 0 8px #ff00de, 0 0 10px #ff00de, 0 0 12px #ff00de, 0 0 14px #ff00de, 0 0 16px #ff00de;*/
font-family: "微软雅黑"; text-align:center; color:#fff; text-shadow:3px 3px 3px red;
font-size:16px;
}
@media(min-width:800px) and (max-width:1280px){.input-group .input-group-btn .btn{ height:2.7em; line-height:2.7em; font-size:26px;}}
@media(min-width:1281px){.input-group .input-group-btn .btn{height:2.3em; line-height:2.3em; font-size:20px; }} /*设置表单组元素统一向左浮动 即让输入框和按钮和在一起*/
.input-group input,.input-group button{float:left;} /* 定义动画帧 开始 */
@-webkit-keyframes glow {
0% {
border-color: #cccccc;
box-shadow: 0 0 5px rgba(102,153,255,.2), inset 0 0 5px rgba(102,153,255,.1);
}
100% {
border-color: #66FFFF;
box-shadow: 0 0 20px rgba(102,153,255,.6), inset 0 0 10px rgba(102,153,255,.4);
}
} @-moz-keyframes glow {
0% {
border-color: #cccccc;
box-shadow: 0 0 5px rgba(102,153,255,.2), inset 0 0 5px rgba(102,153,255,.1);
}
100% {
border-color: #66FFFF;
box-shadow: 0 0 20px rgba(102,153,255,.6), inset 0 0 10px rgba(102,153,255,.4);
}
} @-o-keyframes glow {
0% {
border-color: #cccccc;
box-shadow: 0 0 5px rgba(102,153,255,.2), inset 0 0 5px rgba(102,153,255,.1);
}
100% {
border-color: #66FFFF;
box-shadow: 0 0 20px rgba(102,153,255,.6), inset 0 0 10px rgba(102,153,255,.4);
}
} @-ms-keyframes glow {
0% {
border-color: #cccccc;
box-shadow: 0 0 5px rgba(102,153,255,.2), inset 0 0 5px rgba(102,153,255,.1);
}
100% {
border-color: #66FFFF;
box-shadow: 0 0 20px rgba(102,153,255,.6), inset 0 0 10px rgba(102,153,255,.4);
}
} @keyframes glow {
0% {
border-color: #cccccc;
box-shadow: 0 0 5px rgba(102,153,255,.2), inset 0 0 5px rgba(102,153,255,.1);
}
100% {
border-color: #66FFFF;
box-shadow: 0 0 20px rgba(102,153,255,.6), inset 0 0 10px rgba(102,153,255,.4);
}
}
/* 定义动画帧 结束 */ /*当表单组中组件获得焦点的时候，执行动画*/
.input-group input:focus,
.input-group .input-group-btn .btn:focus{
outline:none;
/*参数依次是：动画名称，完成整个动画所需的时间，规定动画的速度曲线（这里时以低速结束动画），动画播放的次数（值可以是数值，这里时无限）,完成一个周期后是否能逆向播放动画*/
-webkit-animation: glow 800ms ease-out infinite alternate;
-moz-animation: glow 800ms ease-out infinite alternate;
-o-animation: glow 800ms ease-out infinite alternate;
-ms-animation: glow 800ms ease-out infinite alternate;
animation: glow 800ms ease-out infinite alternate;
}